package com.csdj.sc.gateway.filter;

import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class LoginFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();
        String uid = request.getHeaders().getFirst("uid");
        String token = request.getHeaders().getFirst("token");
        if(StringUtils.hasText(uid) && uid.equals(token)){
            //放行
            return chain.filter(exchange);
        }else{
            //没有登录
            ServerHttpResponse response = exchange.getResponse();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            DataBuffer wrap = response.bufferFactory().wrap("no login".getBytes());
            return response.writeWith(Mono.just(wrap));
        }
    }

    @Override
    public int getOrder() {
        return -10;
    }
}
